change default connection timeout 1000ms

[leizhiyuan]

Motivation:

Explain the context, and why you're making that change.
To make others understand what is the problem you're trying to solve.

Modification:

Describe the idea and modifications you've done.

Result:

Fixes ##776

If there is no issue then describe the changes introduced by this PR.

[codecov-io]

Codecov Report

Merging #777 into 5.5 will decrease coverage by 0.12%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                5.5     #777      +/-   ##
============================================
- Coverage     70.73%   70.61%   -0.13%     
+ Complexity     1152     1147       -5     
============================================
  Files           386      386              
  Lines         16062    16058       -4     
  Branches       2589     2584       -5     
============================================
- Hits          11362    11339      -23     
- Misses         3350     3369      +19     
  Partials       1350     1350

Impacted Files	Coverage Δ	Complexity Δ
...java/com/alipay/sofa/rpc/module/LookoutModule.java	52.38% <0%> (-33.34%)	3% <0%> (-1%)
...ofa/rpc/registry/consul/internal/TtlScheduler.java	77.77% <0%> (-5.56%)	7% <0%> (-1%)
...fa/rpc/registry/consul/internal/ConsulManager.java	46% <0%> (-5%)	11% <0%> (-2%)
...alipay/sofa/rpc/api/context/RpcContextManager.java	47.82% <0%> (-4.35%)	4% <0%> (ø)
...fa/rpc/registry/consul/model/HeartbeatService.java	29.41% <0%> (-2.95%)	4% <0%> (-1%)
...m/alipay/sofa/rpc/codec/jackson/JacksonHelper.java	77.77% <0%> (-2.78%)	7% <0%> (-1%)
...ofa/rpc/registry/zk/ZookeeperOverrideObserver.java	39.34% <0%> (-1.64%)	0% <0%> (ø)
.../sofa/rpc/bootstrap/DefaultClientProxyInvoker.java	90.32% <0%> (-1.62%)	0% <0%> (ø)
.../java/com/alipay/sofa/rpc/ext/ExtensionLoader.java	79.6% <0%> (-0.5%)	0% <0%> (ø)
...om/alipay/sofa/rpc/metrics/lookout/RpcLookout.java	75.23% <0%> (-0.24%)	14% <0%> (ø)
... and 3 more

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